<!DOCTYPE html>
<html lang="en" manifest="study.appcache">
 <!-- study.appcache 引入 缓存清单 -->
<head>
	<meta charset="UTF-8">
	<title>Document</title>
</head>
<body>
	<img src="images/img1.jpg" >
	<img src="images/img2.jpg" >
	<img src="images/img3.jpg" >
	<img src="images/img4.jpg" >
</body>
</html>